Well-jar.



T. W. BELL.

WELL JAR.

Patented Sept. 3,1918.

Z a w THOMAS W. BELL, 0F SISTERSVILIiE, WEST VIRGINIA.

WELL-JAR.

v Specification of Letters Patent.

Patented Sept. 3, 1918.

Application filed April 16, 1914. Serial No. 832,348.

To all whom it may concern:

Be it known that I, THoMAs W. BELL, a citizen'of the United States,residing at Sistersville, in the county of Tyler and State of VestVirginia, have invented certain new and useful Improvements inWell-Jars, of which the following is a. specification.

The present invention relates to improvements in'drill jars and has forits object to provide a device of-this character possessing the maximumamount of wearing surface with the desired result of greatly in-'creasing the durability as compared with most devices of this nature inuse at the present time.

The principal aim I have had in mind in the construction of thisinvention has been to provide a jar so arranged that a break occurringat the weakest point of any of its members leaves the remaining sectionsin most favorable condition for fishing out the tool thereby eliminatingthe frequent occurrence of plugged holes due to inability to obtain ahold upon the portions usually left in the hole.

A still further object in view is to provide a jar comprising a pair ofconnecting elements interposed in the drilling line with whichcooperates a link or coupling member having swivel connection with saidelements so as to provide a double swivel, the employment of which givesrise to numerous advantages, such as the prevention of twist in saiddrilling line, the imparting of a double jar, the elimination oflikelihood of jarring of the instant fall of the jar, the latter actionbeing enhanced by forming the parts with fluid passages to enable quickescape of fluid from the member.

These and such other objects as may here- .inafter appear are attainedby the novel construction, combination and arrangement of parts to behereinafter specifically described and claimed. Reference will nowbe hadto the accompanying drawing, forming a part of this specificatlon,wherem:

Figure 1 is a side elevation of an embodipins off the stems, and the-Throughout the following detail description, and on the several figuresof thedrawings, similar parts are referred to by like referencecharacters.

Referring to the drawing and specifically describing my invention, thesame consists of anupper connecting member A provided with a threadedextremity B for connection of the same to the sinker bar of the usualdrilling line employedin boring oil or Artesian wells and a lowerconnecting member C having the screw socket extremity D for connectionof the latter member to the stem of the drilling tool. The upper memberA is formed with a hollow portion E and the lower member C has also ahollow portion F but the latter is considerably longer than the hollowportion E for reasons which will be hereinafter more clearly set forth.A link or coupling member G connects the connecting members A and Ctogether and this link is provided at each end with enlarged heads G, Gwhich are disposed in the respective hollow portions E and F of theconnecting members A and C. The peculiar cooperation of these threemembers obviously provides a double swivel so that the possibility of atwist in the drilling line is absolutely eliminated. As will be obviousby reference to the drawing, the length of the body portion of thecoupling member G permits of relative movement of the connecting membersA and C toward and from each other in the operation of the device, andsuch movement permits the upper connecting member A to impart a blowupon the lower member C when the drilling line is slackened and thedrilling tool is dropped. This is a desirable advantage as will be apparent to those skilled in this art, and, furthermore, this relativemovement permits the coupling member G, or more strictly speaking itslower head G to impart a blow to the lower connecting member C when thedrilling line is raised, thus afi'ording the usual jar action inherentto these devices which are customarily provided for drilling apparatusof this character.

As hereinbefore mentioned the hollow por-' tion F extends longitudinallyof the connecting member C a considerable portion of its length or it isof a length proportionate to the coupling member G which will permitsaid coupling member to drop into the member C in the event of breakageof the coupling member during the use of the device. The reason forarranging the construction as just described, will be apparent becausethe breakage of devices of this character is of common occurrence and myaim in arranging the parts has been to permit the extraction of the toolfrom the hole when such breakage occurs in a most facile manner. Whenthe coupling falls into the hollow portion as mentioned it is easy torun a spear into the last member for extracting the implement. Breakageof the member A will naturally occur at its weakest point which isindicated by the arrow in Fig. 2 and the coupling member of course willremain standing in the hole when this occurs so that a combinationsocket may be lowered into the opening for the purpose of gripping thejar to pull out the implement. Likewise breakage of the comiectingmember C will occur at its weakest point indicated by the second arrowin Fig. 2, and this leaves a hole, or the hollow portion F in which theextracting spear may be inserted for pulling on the remaining portion.

It will be understood that the jar comprehended by my invention will bemade of the best material, the three sections being linked togetherafter being turned or finished by swaging or the closing in process wellknown to those skilled in this art and the cooperation of the members ofthe jar affords a construction which is not so rigid as to cause thepins on the stem to be jarred off.

Another important feature of my invention is the provision of fluidpassages H in the upper connecting member A leading from the hollowportion E exteriorly of said member where it is attenuated or flattenedat opposite sides as indicated at I. The lower connecting member O isalso formed with fluid passages J leading to its attenuated portion Kfrom the hollow portion F and, furthermore, the body portion ofthecoupling member G is of a diameter some- What less thantheextremities of the connecting members so as to permit the passage offluid from above and beneath the heads G, G of the coupling member Gupon movement of the coupling in either the up ward or downwarddirection. The result of this arrangemnt is that the jar easily slideson its swivel and dropping of the same takes place instantl affording amost efficient impact. In addltion, the heads G and G are provided witha plurality of longitudinal grooves G by means of which the fluid passesthe headed portions of the coupling member Gr during relative movementof the members of the jar, these passages co-- operating with thepassages H and J of the connecting members to facilitate the completeremoval of fluid from the device.

Having thus described my invention, what I claim as new is:

1. A drill jar comprising a pair of connecting members interposed in adrilling line, and a link member having swivel connection at each endwith said connecting members.

2. A drill jar comprising a pair of connecting members, and a couplingmember loosely connecting said connecting members together and havinganenlarged head at each end providing a double swivel connection.

3. A drill jar comprising a pair of connecting members, and a couplingmember loosely connecting said connecting members together and having anenlarged head at each end providing a double swivel connection, each ofthe connecting members having a hollow portion permitting relativemovement of each head in its respective connecting member.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS WVLBELL.

Witnesses JosErHE. MAGNER, B2121) FRANKLIN MANNERS.

